From Monroeville to Robinson, from Ross to Bethel, here are the 20 towns with the most registered sex offenders living and working in them. (Information gathered from state police Megan's Law website.)

Channel 4 Action News stopped by dozens of registered sex offenders' homes in Allegheny County. While many did not have decorations, the home of former BNY Mellon vice president of network security Duane Amity did. After the FBI discovered thousands of child pornography pictures on his computer, Amity pleaded guilty. He's a registered sex offender.

"I know his wife, I know his kids, and no, it doesn't bother me," said Amity's neighbor, Ann Bihary.

Others said they want to be in the know, especially on Halloween.

"I'm just surprised how many sex offenders are in the area," said Judith Schlosberg, a grandparent.

A free app calledLife360 helps locate registered sex offenders. Based on your location, the app shows nearby registered sex offenders, including their mug shots and offenses. Each of the icons that pop up represent a sex offender.

Within two miles of Brinton Road and Ardmore Boulevard in Wilkinsburg, the app spotted at least 15 registered sex offenders.

At East Carson and South 19th streets on the South Side, the app netted about a dozen offenders within a couple of miles.

"If that app helps parents into further investigating with regard to what they need to teach their children, then yes, I'm for it," said Alison Hall, executive director of Pittsburgh Action Against Rape.

PAAR said children make up at least 500 of their sexual abuse clients each year. While savvy search tools may help parents feel safe, they say knowing the basics is key.

"I think the most important thing is for children to know their neighbors, and for parents to know their neighbors," Hall said.

Amity's family member said that Amity does not participate in Halloween because it's against his religious beliefs, and said that the decorations are for his children at the home.

Which towns in Allegheny County have the most sex offenders?

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As the largest municipality in Allegheny County, the city of Pittsburgh has the most registered sex offenders. But many offenders also live and work outside city limits.

3 A TRICK-OR-TREAT WARNING. YOU MAY WANT TO THINK TWICE-- BEFORE YOU MAP OUT YOUR CHILD'S HALLOWEEN ROUTE. TURNS OUT-- REGISTERED SEX OFFENDERS-- CAN DECORATE THEIR HOUSES. AND THEY CAN ALSO PASS OUT CANDY! Action News Investigative Reporter Bofta Yimam explains how you can better protect your children. 3 3 THANKS TO MY PHONE--- I CAN TRACK REGISTERED SEX OFFENDERS FROM RIGHT HERE IN OUR STUDIO.AND IT TAKES SECONDS. UNLESS A JUDGE PLACES RESTRICTIONS ON A SEX OFFENDER, THEY HAVE THE SAME FREEDOMS AS ANYONE ELSE ON HALLOWEEN. IT'S AN IDEA THAT SPOOKED. 3 3 WITH HALLOWEEN LOOMING, SOME PARENTS SAY THEIR MIND IS WRAPPED AROUND COSTUMES--NOT SEX OFFENDERS. 3 UNLIKE SOME OTHER STATES, PENNSYLVANIA POLICE SAY THEY DON'T REQUIRE REGISTERED SEX OFFENDERS TO CHECK-IN FOR HALLOWEEN OR PROHIBIT DECORATIONS ON THEIR HOME.now I feel worried 3 WE STOPPED BY DOZENS OF REGISTERED SEX OFFENDERS HOMES IN ALLEGHENY COUNTY.WHILE MANY DID NOT HAVE DECORATIONS, 3 HOME DID.FORMER BNY MELLON 3 VICE PRESIDENT OF NETWORK SECURITY DUANE AMITY LIVES HERE. AFTER THE FBI DISCOVERED THOUSANDS OF CHILD PORNOGRAPHY COMPUTER, AMITY NOW A REGISTERED OTHERS SAY THEY WANT TO BE IN-THE-ON HALLOWEEN.WE SHOWED SOME PARENTS AN APP CALLED LIFE 360---THAT HELPS LOCATE REGISTERED SEX OFFENDERS. THEN--- 3 BASED ON YOUR APP SHOWS NEARBY OFFENDERS--MUGSHOT AND CLOSER LOOK--EACHá REPRESENT A SEX 3 OFFENDER.WITHIN TWO MILES OF BRINTON ROAD AND ARDMORE BOULEVARD IN WILKINSBURG, THE APP SPOTTED AT LEAST 15 REGISTERED SEX OFFENDERS. ---SOUTHSIDE'S EAST CARSON AND SOUTH 19TH STREET NETTED ABOUT A DOZEN WITHIN A COUPLE MILES. 3 PITTSBURGH ACTION AGAINST RAPE SAYS CHILDREN MAKE UP AT LEAST 500 OF THEIR SEXUAL ABUSE CLIENTS EACH YEAR. WHILE SAVVY SEARCH TOOLS MAY HELP THEY SAY KNOWING THE BASICS IS KEY. 3 A REALLY EASY WAY TO GET THE FREE APP WE USED, GOOGLE LIFE 360 ON YOUR PHONE, THEN CLICK "VIEW" AND THE TAB TO INSTALL IT. WE DOUBLE CHECKED THE LIFE 360 APP WITH THE STATE POLICE WEBSITE. WE SUGGEST YOU DO THE SAME.. FOR ANY OF THE SEX OFFENDER APPS. TO CHECK WHERE SEX OFFENDERS ARE LIVING IN PITTSBURGH NEIGHBORHOODS-- GO TO WTAE.COM-- AND CLICK "ON TV" 3 3 3 A developing story out